Stages, Stalls and Jumbo Jets: teacher key

Airplanes, grade 10 edition, written for 10th grade. A jet engine runs in stages, a wing can stall if it is tilted too far, and thin air changes what a plane can do. See how airliners grew from ten seats to more than 850.

Read the book. Print this page for the key.

Questions and answers

1. What turns the compressor in a jet engine?
   • A shaft from the turbine (answer)
   • A battery
   • The wings
2. In a typical jet engine, how much fuel is mixed with 100 pounds of air per second?
   • 50 pounds per second
   • 100 pounds per second
   • 2 pounds per second (answer)
3. What happens in a stall?
   • The flaps tilt down
   • The wing suddenly loses lift after being tilted up too much (answer)
   • The engine runs out of fuel
4. Why can a plane not fly above its flight ceiling?
   • It cannot make the lift it needs to stay airborne (answer)
   • The engine gets too hot
   • The wings turn upside down
5. What did the Boeing 307 Stratoliner do that other airliners of its day did not?
   • Fly without wings
   • Carry 850 passengers
   • Cruise at 7,500 meters (answer)
6. What did the Wright brothers use a wind tunnel to test?
   • The weight of passengers
   • The shapes of wings and tails of their gliders (answer)
   • Their engine's fuel

Words

• combustion: burning
• stall: sudden lift loss
• turbulent: rough, swirling
• turbine: windmill-like part
• altitude: height